Dark energy : More than two-thirds of the total energy of the universe is in a form we don’t yet understand. Two popular models for it are known as the cosmological constant and quintessence.
Welcome to my website
I'm an astronomer, science writer, and musician based in Dundee, Scotland. On this website, now into its 17th year, you'll find about 15,000 pages of information divided into four major encyclopedia – of science, alternative energy and sustainable living, history, and science for children. Another encyclopedia, of music, can be found at my Songs of the Cosmos website. There are links to all these resources on this page.
Also on this page, down the right-hand side, you'll see listed many of my books and my music album, together with links to them at Amazon. Most of the books are available in print or Kindle format; the album can be downloaded or streamed from all major digital platforms, including iTunes and Spotify.
Many thanks for stopping by. For daily updates, please follow me on Facebook and Twitter